Scope of indoles and acrylatesa,b.
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Reaction conditions: 1 (1 equiv, 0.2 mmol), 2 (3 equiv, 0.6 mmol), [RuCl2(p-cymene)]2 (5.0 mol%), AgSbF6 (20 mol%), Cu(OAc)2·H2O (1.2 equiv, 0.24 mmol), THF (0.5 M), 50 °C, 24 h.
Isolated yield; (Me = methyl, Et = ethyl, Bn = benzyl, Ph = Phenyl, PMB = p-methoxybenzyl).